STP1207

    Dislocation Emission and Dynamics Under the Stress Singularity at the Crack Tip and Its Application to the Dynamic Loading Effect on Fracture Toughness

    Published: Jan 1994


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    Abstract

    In previous work, computer simulation of dislocation emission and motion was carried out considering the stress singularity near the crack tip. It was found that there is a region in which no dislocation exists along the slip plane near the stressed source, namely, a dislocation free zone (DFZ), and that there is an inverse pileup of dislocations against the tip of this DFZ. A formula was obtained correlating the maximum dislocation density with the DFZ length.

    Based on those results, an evaluation has now been attempted for fracture toughness within the brittle-ductile transition range of steel. The effect of dynamic loading on the fracture toughness and trigger point observed in the experimental results reported in the literature is explained.

    Keywords:

    dislocation dynamics, dislocation free zone, stress rate dependence, stress singularity at the crack tip, inverse pileup, brittle-ductile transition, dynamic loading effect on fracture toughness


    Author Information:

    Yokobori, AT
    Associate professor, Tohoku University, Sendai,

    Iwadate, T
    Japan Steel Works Ltd., Hokkaido,

    Isogai, T
    Faculty of Science and Engineering, Teikyo University, Tochigi,


    Paper ID: STP13721S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP13721S


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